Burner for stereopticon and motion-picture machines.



F. W. BELL.

BURNER EUR sTEREoPTIGoN AND MOTION PICTURE MACHINES.

APPLIOATIONIILED MAR. 21, 1913.

Patented J an. 6, 1914.

[N VEN TOR Allomey WITNESSES FRANCIS W. BELL, OF NUNICA, MICHIGAN.

BURNER FOR STEREOPTICON AND MOTION-PICTURE MACHINES.

Specification of Letters Patent.

Patented Jan. 6, 1914.

Application filed March 21, 1913. Serial No. 756,050.

To all 'whom it may concern Be it known that I, FRANCIS W. BELL, a citizen of the United States, residing at Nunica, in the county of Ottawa and State of Michigan, have invented certain new and useful Improvements in Burners for Stereopticon and Motion-Picture Machines, of which the following is a full, clear, and exact specification.

This invention relates to incandescent burners, of the type disclosed in my application filed November 25, 1912, Serial No. 733,399, especially adapted for projecting stereopticon and motion pictures, and has for its object to provide an economical burner capable of giving a very high candle power light for these purposes.

Another object is to produce a burner having a plurality of incandescent mantles so arranged and overlapped that an unbroken field of light of substantially unifrom intensity is produced.

A further object is to produce a burner employing a plurality of incandescent mantles arranged to generally conform to the shape of the picture to be projected.

Still other objects are to attain the maximum intensity in the light projected from a group of incandescent mantles, and to gain all of the foregoing objects in a burner using gas manufactured in its own individual generator, whereby the present improved burner may be employed with equal success in cities and rural districts.

The invention will be first hereinafter described in connection with the accompanying drawings, which constitute a part of this specification, and then more particularly pointed out in the claims at the end of the description.

In the drawings, wherein the same reference characters are used to designate similar parts throughout: Figure 1 is a side elevation of a burner constructed in accordance with my invention and applied to the lamp house of a motion picture apparatus, said lamp house and the condensing lenses and reflector therein being shown in section, the generator attached to the lamp house being also shown in side elevation. Fig. 2 is a front elevation of the burner proper, Fig. 3 is a top plan View of the same, and Fig. 4 is a front elevation showing a different arrangement of mantles.

As illustrated in the drawings, the burner is adapted to support a central mantle A,

two end mantles B, B, and two intermediate mantles C, C. The central and end mantles are preferably arranged in the same transverse plane or, in other words, are in alinement with one another viewed from either side of the burner. The intermediate mantles are in alinement with each other viewed in the same direction, but are arranged slightly in rear of the other mantles. Said intermediate mantles should be placed not more than one inch behind the front mantles, for otherwise they will impair the uniformity of the light. The rear mantles are also slightly overlapped upon the front mantles so as to leave no break in the eld of light, see Fig. 2.

The five mantles are adapted to be supported on one or the other of two tubular transverse members D and E to which gas is supplied by longitudinal pipes F and Gr, respectively. The lower one, D, of said transverse members, is provided with five upwardly extending branches suitably arranged and spaced to support five mantles in the relative positions already described and as illustrated in Fig. 4:. The middle branch (Z is designed to support the central mantle A, the next branches d', d, on either side, are intended to support the intermediate mantles C, C, while the end branches d2, d2,inay support the end mantles B, B, Fig. 4.

It will be seen by reference to Fig. 1 that the branches d', d', are offset rearwardly from the plane of the other branches and the member D, in order to support the intermediate mantles in proper position slightly in rear of the other mantles, as described. All of the five branches of the member D terminate at the same height, but the branches d and d2 are provided with removable tubular extensions d3 and d?, respectively, the extensions d4 being longer than the extensions d3, see Fig. 2. The upper member E has two branches e arranged above and in alinernent with the end branches Z2 of the lower member.

It is sometimes desirable to have a generally circular or oval ield of light radiated by the burner in order to secure uniform intensity over the entire surfacey of the condensing lens. For this purpose, the burner may be equipped with different sizes of mantles, as illustrated in Figs. 1 and 2. The central mantle in this instance is longer than any of the others, while the intermediate mantles are somewhat shorter and the end mantles shorter still. All the mantles are placed with their transverse median lines in the same horizontal plane, so that the general outline ot the entire group is circular or oval. It will be noted that the extensions Z3 are used on the branches d to support the intermediate mantles. The extensions (Z4 are also shown in Fig. 2 as applied to the branches Z2 in position to support the end mantles, if desired, but in this ligure said end mantles are shown supported on the branches e of the upper member E, it being optional which of these arrangements is employed. Vhen said end mantles are supported on the branches c, as here shown, the flow of gas is cut 01T from the branches Z2 by valves d5.

If a square or rectangular field of light is preferred, the arrangement illustrated in Fig. 4 may be employed. In this instance, the extensions Z3 and d4 :for the branches cl and cl2, respectively, of the lower member D, are removed, the pipe F and member E also taken oli", and five mantles of uniform length are placed on the five branches of said lower member. The valves Z5 are, of course, opened to supply gas to the end branches cl2, and the valve 7c, Fig. l closed.

The supply pipes F and G for the upper and lower members D and E, respectively, preferably extend rearwardly beyond the lamp house I-I and are there connected to a pipe I leading from the generator K. A valve g is placed in the supply pipe G in order to cut ofl" the flow of gas to the lower member D when desired, as when the burner is not in use.

rIhe generator may be rigidly connected to the lamp house by links or connecting bars Lto permit the burner to be adjusted longitudinally of said lamp house without disturbing the connection of pipe I with said generator. It will be understood that any suitable generator may be employed which is adapted to make gas from gasolene, alcohol, or other hydrocarbon.

In Fig. l, M designates the usual condensing lenses, and N a reflector suitably supported in the lamp house behind the burner. The use of the reflector raises to the maximum the intensity of the light projected frofn the group of mantles, the thin films of the mantles themselves offering practically no obstruction to the passage of the reflected light.

t)It will be understood that detail changes or alterations may be made in the structures herein shown and described without departing from the spirit or sacrificing the advantages of my invention. For instance, the end mantles may be dispensed with by closing the valves Z5 and 7c and the burner operated with only the three middle mantles which may be of different sizes, as shown in Fig. 2, or of the same size, as illustrated in Fig. 4f. Moreover, the upper and lower members D and E may be reversed or inverted so that the majority or all of the mantles may be supported by the upper` instead of the lower member, if desired.

I-Iaving thus described my invention, what I claim as new and desire to secure by Letters Patent of the United States is:

l. The combination with an incandescent burner having a plurality ot spaced mantles arranged in a plane transverse to the direction of projection of the light, and a plurality of mantles arranged in a plane parallel to the plane ofV the first mentioned mantles and each overlapping one of the spaces between said first mentioned mantles, of a projecting lens arranged parallel to the plane of said first mentioned mantles.

2. In an incandescent burner, the combination with a central mantle, of smaller mantles arranged at either side thereofand overlapping said central mantle, and other still smaller mantles arranged at the outer sides of the medium sized mantles and overlapping the same, the medium lines of all of the mantles being arranged in the same horizontal plane. Y

3. In an incandescent burner, the combination with upper and lower tubular members, each having a plurality of branches extending toward each other, of mantles adapted to overlap one another when mounted on said branches, certain of the branches on the respective members being arranged in vertically alined pairs, whereby mantles can be operatively carried by only one of each ot said pairs of branches at a time, and each branch of each vertically alined pair being constructed to support a mantle when the other branch of the same pair carries no mantle. Y

4c. rlhe combination with an incandescent burner having two spaced mantles arranged in a plane transverse to the direction ofk projection of the light, and a mantle arranged out ot' the plane of the first mentioned mantles and overlapping the space between them, of a reflector arranged behind the mantles and parallel to the plane of said first mentioned mantles.

5. In an incandescent burner, the combination with a tubular member having a plurality of branches extending in the same direction, of mantles adapted to be supported directly on all of said branches with their median lines in the same horizontal plane, and extensions for certain of said branches, said extensions adapted to carry the mantles instead of their respective branches, whereby 6. In an incandescent burner, upper and lower tubular members arranged in the same vertical plane and having branches eXtending toward one another and arranged in the same plane with the two members, one of said tubular members also having a branch intermediate of the other branches and projeoting out of the vertical plane of said members, and mantles adapted to be su ported on the branches to form an overIappng group.

7 In an incandescent burner, upper and lower tubular membersarranged in the same vertical plane and having branchesV extending toward one another and arranged in the same plane with the two members, one of said tubular members also having a plurality of branches arranged in a plane parallei to the plane of the other branches and intermediate of said other branches, and mantles adapted to be supported on the branches to form an overlapping group.

In testimony whereof I have signed my name to this speoioation in the presence of two attesting witnesses.

FRANCIS W. BELL.

Witnesses THOMAS HINsnEY, ED. A. BROWN Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

